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OpenRouter

One API key to many model providers — useful for comparing models without N dashboards.

Best for: Multi-model experiments & failover

Pricing: Pay-as-you-go

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Strengths

Model shopping in one place
Fallback routing patterns
Good for evals

Watch-outs

Another middleman in the trust chain
Pricing complexity

Appears in these stacks

Model evals & bake-offs · primary — Hit many models with one key for bake-offs.
Agentic research assistants · supporting — Swap models behind an agent.